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>The lines between what's considered native or foreign in nature and in demographics can be blurry, especially over long periods of time.

It's quite simple, actually.

If humans had any part in introducing a species to a given location which wasn't there before, it is invasive.

If humans had no part in the aforementioned process, it is native or at the very least natural.

That is not the definion I'm accustomed to. To me, invasive means both "non-native" and causing an issue to the indeginous ecosystem.

Found an article which seem to mirror my understanding of the terms:

"Invasive: a species of plant or animal that outcompetes other species, causing damage to an ecosystem." https://lakes.grace.edu/native-non-native-invasive-species/